#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
using namespace std;



class stack
{
private:
	int* _a;
	int _capacity;
	int _size;
public:
	void Init()
	{
		//this->_a = ....
	}
	void Push(int x);
	
};

int main()
{
	stack s1;
	s1.Init();
	return 0;
}